Telephone system



Dec. 16, 1941.

U. KESTEN TELEPHONE SYSTEM Filed Dec. 2l, 1939 2 Sheets-Shea?I 1 Dec. 16, 1941. U, KESTEN I 2,266,215 r TELEPHONE SYSTEM Filed Dec. 2l, 1939 2 Sheets-Sheet` 2 n, 7 E Invear Attorney Patented Dec. 16, 1941 l UNITED STATES PATENT' OFFICE TELEPHONE SYSTEM Ulrich Kesten, Cazilienhof, Germany, asaignor to Fides Gesellschaft fr Verwaltung und Verwertung von gewerblichen Schutzrechten mit beschrnkter Hat poration of Germany tung, Berlin, Germany, a cor- Application December 21, 1939, Serialv No. 310,282 In Germany November 15. 1938 13 claims. (cl. 17a-'27) when the time for recording the number of the calling subscriber occurs to identify the calling subscriber by a test device and then to transmit to the central recording device by an adjoining impulse sending apparatus suitable series of impulses corresponding to the individual digits of the calling number.

This operation besides being complicated by inherent diiculties also takes a comparatively long time to carry out, during which time the device in question cannot be used for determining other calling numbers.

The object of the present application is to cut short, as far as possible, the time required for repeating the number of the calling subscriber and at the same time to make possible the determination of several calling numbers, for which end dilerent A. C. frequencies or combinations of frequencies individual to each subscriber are connected for marking purposes to each subscribers connecting device by which the subsequent recording device in the connecting arrangement is so operated that the recording element is set corresponding to the number of the calling subscriber concerned.

The drawings illustrate a particular embodiment of the invention in Figs. 1, 2 and 3. All

switch apparatus and circuit arrangements which ,nected The subsequent connecting steps, by

which the calling subscriber obtains the required station are not shown. The calling subscriber is supplied with current in the usual manner over relays A and B in the group selector. The'cutoff relay T is energised, and initiates known op erations which are not further shown. yRelay Cj Y is energised in the group selectorf'over wiper c of the pre-selector and an off-normal contact 31::y which is closed as long as the group selector is in Y its zero position, and holds over: its own contact Y 2c during the connection independently of the off-normal contact. At contact V4c the short circuit of winding I of the test relay P is removed.

The test and locking conductors between the i pre-selector and group-selector and group selector and repeater are, for the purpose of the following invention, connected together by the condenser Coc. 1

When the group selectors are set on a free repeater ZZZ a test circuit is established over wiper c of the group selector, in which both windings of test relay P in the group selector and seizing relay CI in the repeater are energised.

Contact 5p closes and short circuits the high re-v sistance winding II of relay P so that, in known manner, the free repeater selected is locked against further seizing. At contact lcl, a start circuit for the ilnder switch ASI is' completed so that the finder switch is stepped-on, until it hasl found the line in which relay C is energised. The following circuit is thencompleted: earth, battery, winding of,re1ay E, contact Scl, wiper b of the iinder Switch ASI, windings I. and II of relay Pl, earth Contact Bpl closes and short circuits the high resistance winding II of relay PI. The following circuit is completed by contact Illpl: earth, contact Illpl, winding of relay U, resistance Wi2, battery, earth. Relay U is energised in this circuit and at contact |311, switches in relay X. At contact 35u earth potential is disconnected, in the marking device DE, from a start conductor leading to an assessor switch.

The recording device is now ready to receive the marking signal corresponding to the number of the calling subscriber and, in known manner, to operate the type-wheel of apparatus.

The apparatus for marking the calling subscriber is indicated in Fig. 1. It is assumed that a marking device is provided for each of subscribers. It consists of a transmitting or contact device KE and a frequency generator FE, which is able to generate frequencies singly and in dilferent combinations. This frequency generator may naturally be connected in common for all transmitting. devices.` With each subscriber are associated two contacts of the contact device KE, a contact z for marking the the printing tens position and a contact e for marking the generatedby it, singly or combined one with the other.

For marking the digit I frequency QI is used,

For marking the digit 2 frequency QII is used.

For marking the digit I frequency QIII is used,

For marking the digit I frequency QIV is used,

For marking the digit 5 a mixture of frequencies QI-i-QII is used,

For marking the digit i a mixture of frequencies QI-i-QIII is used.

For marking the digit 1 a mixture of frequencies For marking the digit fa mixture of frequencies QII-i-QIII is used, l

For marking the digit 9 a mixtureof frequencies QII-i-QIV is used.

For marking the digit Il a mixture of frequencies QIlI-l-QIV is used.

Separate blocking circuitsre provided (Sp1, SpII, SpIII and SpIV) in the frequency generator to separate the frequencies from each other. This means that the blocking circuit Sp1 blocks the frequency QI. In similar manner the blocking circuits SpII, SpIII and SpIV block the frequencies Q11, QUI and QIV.

The frequency QI is connected over contact hr and the connection MI to the contacts z of the subscribers with the tens position 1, i. e. subscribers II, I2, I2 I0. Further, frequency QI is connected over the same contact hr to the contacts e of the subscribers who have the digit "1 in the last position i. e. subscribers II, 2l, Il 0i.

The frequency QII is connected over another contact hr and connection M2 to the contacts z of all subscribers whose penultimate digit is "2", i. e. subscribers 2l, 22, 22 2l. Further fre' quency QII is connected over the same contact hr to the contacts'e of all the subscribers who have the digit 2 as a last figure.

Similar connections lobtain for frequencies QIII and QIV.

The contacts z of all subscribers of the fifth series of tens, subscribers'il, 52, 5I i0 (not shown) are connected to the frequency mixturev QI+Q1I over another contact hr which, as al,-

tacts e of all subscribers whose units number is the digit "5; subscribers I5, 25, 35 U5. The

All contacts z, e, hr and ha are controlled in the necessary timing by a machine which is permanently running or is set in motion on a connection being set up. The contacts are operated separately as Fig. 2 shows. By tappet-discs or cylinders mounted on an axisand turning in an anti-clockwise sense all contacts hr are opened simultaneously and then all contacts ha together with all contacts z are closed. The frequency or mixture of frequencies required for the marking. of the hundreds yposition of the calling number is connected over one of the contacts ha and one of the contacts z to the wiper c of the subscribers preselector. After a half turn (e. g. about 250 milii-secs) of the plate or cylinder the contacts ha and z are again opened.

, A pause of about ms. follows. Then contacts 'Ihe frezalone are closed for about 50 ms.

quency or mixture of frequencies necessary for marking the tens position of the calling subscribers number is., connected over the operated contacts z and the next contacts hr to the single preselector wiper c. A pause of about 50 ms. again follows and thereupon likewise for about 50 ms.'all contacts e are closed. The frequency or mixture of frequencies for marking the units position of the calling subscribers number is connected over the operated contacts el and rest contacts hr to the preselector wiper c.

The first impulse for marking the hundreds position is made longer (about five times as long) than the tens and units impulse to ensure a -trouble-free recording, of the calling number.

The long impulse serves, as will be explained subsequently, to make the recording device ready to receive the frequency or mixture of frequencies associated with the calling number. Thus the recording of the separate positions of the calling number in the right order ais ensured.

In the following example it is assumed that the subscriber's (Tn) number has its last three positions given by the digits 913". The wiper c of the preselector of the subscriber shown is connected to the condenser characterized by the digits 1.3.

When the initial impulse begins, i.-e. when the contacts ha and z are closed, the frequency mixture QlI-i-QIV is. connected -to the wiper c of the preselector for marking the digit 9:

- wiper c of the preselector, condenser V I2, contact '55 the preselector of the subscriber: wiper c of the contacts of the other subscribers are wired to the different vfrequencies or .mixtures of frequencies in a manner which is apparent without further explanation. Y

While contact z marks the tens position and contact e the units position of thecalling number, marking for the hundreds position of the calling number takes place over the working contact ha.. The connection for all the contacts ha is connected, inthe embodiment, over llunction point MI to the marking device for the digit 9, i. e. with the frequencies mixture QII-i-Qlv.

preselector, condenser I3, contact 2,-connection MI, rst contact hr, frequency QI. The tens position is marked therebyby the digit 1". After a further .interval contact c is closed. Thereby, frequency QDI is connected to the .wiper c of the preselector: wiper c of the prese- ASI. 'I'hereby relays U and X are energised after` relay PI energises. Four frequency filters FQI, FQII, FQIII, FQIV -are now connected to the testand locking conductors of the repeater, over which the frequencies are repeated. They are, since frequency lters are known, shown but schematically. The frequency nlter FQI transmits only frequency QI and blocks all other frequencies. Similarly frequency lter FQlI transmits only the frequency QII, frequency iilter FQIII transmits only the frequency QIII and frequency lter FQIV transmits only frequency QIV. Each frequency nlter is connected to the grid of a valve ERI, ER2, ERI. ER4 while each anode of the. valves is connected to one ofthe vrelays Sl, S2, S3 and S4. All of these relays are connected to the windingof a relay. Hwhich has earth connected to the other end of its winding.

` device over contactsof the 're1aysS2 and S4. vIt

AUl

If a'frequency or mixture. of frequencies is sentcloses anda start impulse is` sent, over contact 36a: which is already closed, to an assessor switch Y which in known manner (not shown) is stepped over the contacts of its contact bank until it finds is repeated by the assessor'switch to a type-wheel and, in known manner, printed. Thereupon the frequency QI which controls relay'Sl in therecording device is connected for the tens digitrso that the digit l is set intheprinting device by the assessor apparatus.v Now the frequency QIII which energises the relay Siin the recording apparatus RE is connected" for 'marking the units' digit so that the type-wheel isset on the digit"3 by the assessor switch.

The operations for. setting theassessor switch and type-wheels are notnecessary for a full disy closure of the invention and areinot described in detail. It is onlymentloned, that it isnecessary to provide an arrangement to matchl the operation of the assessor switch with the Aoperation l the contact device KE or the speed of the contact `gised on being short circuited. Contact 35u earth potential over the required contacts ofthe i relays SI to S4. Simultaneously with the 'assessor switch the type-wheel of a printing'device is set, in a manner not shown'here, on a required digit.

If the frequency QI is sentfrom the marking device and therewith relay Si in the registering apparatus RE is energised,.contact l in the asses-` sor switch contact bank is connected to 'earth over contacts |6s4, 22s3, 28s2 and 34sl. After the first step the assessor switch comes to rest and the cypher l is recorded.

If the frequency QII is sent (relay S2 energised), contact 2 in the assesor switch contact bank is connected to earth potential over contacts l6s4, 22s3, 29s2 and 30st. If the frequency QIII is sent (relay S3 energised) contact 3 is marked over contacts |6s4, 23.93, 25s2, 3|sl, while if frequency QIV is sent and relay S4 responds, contact 4 in the assessor switch contact bank is marked over contacts Ils4, l9s3, 2Is2 and 26sl If the frequency mixture QI and QII is sent and relays Si and S2 are energised, contact 5 of the assessor switch contact bank is marked over contacts I6s4, 22s3, 29s2 and 33sl. If the frequency mixture QI+QIII is sent (relays SI and S3 energised) contact 6 of the assessor switch contact bank is connected with earth potential over contacts |684, 23s3, 25s2, and 328|. The frequency mixture QI-i-QIV controls the two relays SI and S4 so that contact 1 of the assessor switch contact bank is marked over contact I1s4, |9s3, 2Is2, 21sl. If frequency mixture QII-l-QIII (relays S2 and S3 energised) is sent, contact 8 of the assessor switch contact bank is connected with earth potential'over contacts I6s4, 23s3 and 24s2. The frequency mixture QII-i-QIV controls relays S2 and S4 so thatcontact 9 of the assessor switch contact bank is marked over contacts l1s4, |9s3 and s2, while, finally, if frequency mixture QIII-l-QIV is sent and relays S3 and S4 respond, the contact 0 in the assessor switch contact bank is connected with earth potential over contacts l1s4 and |8s3.

If the frequency mixture QII-i-QIV is now connected to the locking conductor, for the purpose Vof marking the number of the subscriber concerned', the digit 9 is marked in the recording vention and is therefore not shown'.

device with the mode of working of the assessor switch. l

Whenthe number of the calling subscriber is marked, a signal is sent from the printing device by which relay Y is energised. Relay'Y holds'itself energis'ed for the duration-of the connection in the circuit: earth,.battery, winding of relay Y, contacts 311/, 38pl,earth. v Contact 811 opens and the receiving .apparatus EE is disconnected from ythelocking conductor of the repeater sothat further `closing of contacts in the marking device is without effect on the recording device shown.

The disconnection of the call and the apparatus illustrated is Without` Sgnicance tothe in- Another embodiment may be shortly described.

Instead of marking the single positions ofthe c calling number one after the other by a contact device, by omission of the contact device, a different continuous combination of frequencies for each subscriber is connected to the preselector. For subscribers however` l20 different frequencies must be provided of which 10 must be thought of as ordinates and l0 as abscissae. combination abscissae frequency and ordinate frequency is different for each subscriber.l The receiving apparatus must then be so arranged, that the 20 frequencies are separate and for each subscriber individual marking is arranged. Having regard to the complication of the receiving and marking devices and the fact that several frequencies have to be provided it appears that the former arrangement is simpler and is preferable.

1. In a telephone system,`a group of lines, switching apparatus, a line switch for each of said lines, means for placing a calling condition on one of said lines to thereby operate the line switch therefor to seize said vswitching apparatus, means for thereafter controlling said switching apparatus to establish a connection, a prethereon.

2. In a telephone system, a calling'line, afcalled line, switching apparatus for setting up a connec- The ` of said calling line telephone number.

3. In a telephone system, a'group oi lines, an individual switch terminating each of said lines, switching apparatus accessible to said switches, means responsive to a\cal1 on any one of said lines for operating the switch individual thereto to thereby seize said switching apparatus, means for thereafter operating said switching apparatus to extend a connection, means for transmitting coded alternating current pulses to each of said individual switches indicative of the individual telephone numbers of the lines connected thereto, and means temporarily associated with said switching apparatus responsive to the extension of said connection for translating the coded pulses received over the individual switch involved in said connection into numerical digits indicative of the telephone number of the calling line involved in said connection.

4. In a telephone system, a group of lines, an individual switch terminating each of said lines, switching apparatus accessible to said switches, means responsive to a call on any one oi said lines for operating the switch individual thereto to thereby seize said switching apparatus, means for thereafter operating said switching apparatus to extend a connection, means for transmitting la predetermined number of pulses of alternating current to each of said individual switches, each pulse transmitted being indicative of a digit of the telephone number of a plurality of the lines connected to said individual switches, and means temporarily associated with said switching apparatus operated by said impulses for registering the telephone number of the calling line involved in said connection.

5. In a telephone system, a group of lines, an individual switch terminating each of said lines, switching apparatus accessible to said switches. means responsive to a call on any one of said lines for operating the switch individual thereto to thereby seize said switching apparatus, means for thereafter operating said switchingapparatu's to extend a connection, means for continuously transmitting alternating current pulses to said individual switch indicative of the telephone number of the line connected thereto, and means temporarily associated with said switching apparatus operative by said pulses in response to the extension of said connection for registering the telephone number oi the calling line involved in said connection.

6. In a telephone system, a group of lines, switching apparatus, an individual switch for each of said lines operative in response to the initiation of a call by a subscriber thereon for connecting the said line with said switching ap*- paratus, means for operating said apparatus to thereby establish a connection with a desired called line, means common to said group of lines for transmitting alternating current pulses to each of said individual switches indicative of the telephone number of the line connected thereto, each pulse transmitted being indicative of one of f the digits of the telephone number of the lineA connected thereto, and means temporarily associated with said switching apparatus operative in response to said alternating current pulses transmitted to said individual switch involved in said connection for registering the digits of said call: ing line telephone number for the purpose o! controlling a recorder to thereby record said calling line telephone number.

'1. In a telephone system, a plurality of lines, switching apparatus for extending connections from said lines, means common to said lines for simultaneously connecting alternating current signals to each of said lines indicative of the telephone number therefor, and means temporarily associated with said switching apparatus responsive to a connection and operative in response to the signals transmitted to the line involved in said connection for registering said line telephone number.

8. In a telephone system, a'plurality of subscribers lines, an individual line switch terminating each of said lines, means for extending a, call from any one of said lines over a connection including the lineswitch individual thereto, translating means temporarily associated with said connection, means associated with said line switches for transmitting alternating current pulses over said lineswitch involved in said connection to said translating means, the number o! said pulses corresponding to the number of digits in the telephone number of the line associated with said lineswitch, and means controlled by said translating means for registering the digits of the telephone number oi' said line involved in said connection.

9. In a telephone system, a group of lines, an individual switch terminating each of said lines, switching apparatus accessible to said switches, means responsive to a call on any one of said lines for operating the switch individual thereto to thereby seize said switching apparatus, means for thereafter operating said switching apparatus to extend a connection, 4means for repeatedly transmitting a predetermined number of pulses to said individual switch corresponding to the telephone number of the line connected thereto, each pulse transmitted being indicative of one of the digits of the telephone number` of the line connected thereto, and means temporarily asso-5 ciated with said switching apparatus operated by the transmitted pulses in response to the extension of said connection for registering the telephone number of the calling line involved in said connection.

10. In a telephone system, a group of lines, an individual switch terminating each of said lines, switching apparatus accessible to said switches, means responsive to a call on any one ofsaid lines for operating the switch individual thereto to thereby seize said switching apparatus,

means for thereafter operating said switching apparatus to extend a connection, means connected to each of said individual switches for repeatedly transmitting impulses of current corresponding to the individual telephone numbers of the lines connected thereto, said impulses being equal in number to the number oi' digits ofa subscribers telephone number, and means tem? porarily associated with said switching apparatus in response to the extension of said connection controlled by said impulses forregistering the telephone number of the callingl line involved in said connection. A

11. In a telephone system, a group of lines, switching apparatus accessible to said lines, means for repeatedly transmitting signals indicative of the telephone number of each of said lines, said signals comprising a plurality of impulses of current for each telephone number and only a single impulse of current for each digit of a number, means operative responsive to a call on any one of said lines for seizing said switching apparatus, means for thereafter operating said switching apparatus to extend a connection from said calling line. whereby the signais indicative of said calling line telephone number are repeatedly transmitted over said connection, a registering device, means operative in response to said connection for associating said registering device with said connection to thereby register the telephone number of said calling means for extending a connection from a Vcalling one of said lines. automatic means repeatedly transmitting impulses of current coded so that each impulse represents one oi the digits of the line, and means operated in response to a single telephone number of said calling subscribers line,

means associated with said connection for translating the coded impulses representing the digits of the telephone number of said calling line into numerical digits for recording purposes.

13. In a telephone system, a subscribers line, means for extending a connection from said line, means for repeatedly transmitting impulses of current coded so that each impulse represents a digit of the telephone number of said line, and means associated with said connection for translating said coded impulses into a numerical telephone number for recording purposes.

ULRICH KESTEN. 

